US Patent No. 10,091,914

FAN CONTROL DEVICE


Patent No. 10,091,914
Issue Date October 02, 2018
Title Fan Control Device
Inventorship Jun Yokoyama, Tokyo (JP)
Assignee NEC CORPORATION, Tokyo (JP)

Claim of US Patent No. 10,091,914

1. A fan control device for controlling an air cooling fan that directs outside air into an electrical apparatus, the fan control device comprising:a rotation number deciding unit configured to decide a rotation number of the air cooling fan based on a result of detection by an intake air temperature sensor detecting an intake air temperature;
a determining unit configured to perform a determination whether an amount of change of the intake air temperature during a predetermined period is equal to or greater than a first threshold amount of change of the intake air temperature during the predetermined period, the determination based on the result of detection by the intake air temperature sensor; and
a controlling unit configured, in a case in which the determining unit determines that the amount of change is equal to or greater than the first threshold amount of change of the intake air temperature, to correct the rotation number decided by the rotation number deciding unit, based on the result of detection by the intake air temperature sensor and a result of detection by an intake air humidity sensor detecting an intake air humidity, and causing the air cooling fan to rotate at the corrected rotation number,
wherein the controlling unit is further configured, after correcting the rotation number decided by the rotation number deciding unit so as to decrease the rotation number, to gradually increase the rotation number of the air cooling fan until the rotation number of the air cooling fan becomes the rotation number decided by the rotation number deciding unit.